/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.servicecomb.foundation.auth;

import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.apache.servicecomb.foundation.common.utils.SPIServiceUtils;

public class AuthHeaderLoader {
  private final List<AuthHeaderProvider> authHeaderProviders =
      SPIServiceUtils.getSortedService(AuthHeaderProvider.class);

  private static final AuthHeaderLoader INSTANCE = new AuthHeaderLoader();

  private AuthHeaderLoader() {

  }

  public static AuthHeaderLoader getInstance() {
    return INSTANCE;
  }

  public Map<String, String> loadAuthHeaders(SignRequest signRequest) {
    Map<String, String> result = new HashMap<>();
    authHeaderProviders.forEach(provider -> result.putAll(provider.getSignAuthHeaders(signRequest)));
    return result;
  }
}
